Yellow Iris
Iris pseudacorus L.
- light
- Full sun
- water
- Plenty
- tall
- 91 cm
- wide
- —
Iridaceae
Formerly Acorus adulterinus, Iris acoriformis, Iris acoroides, Iris bastardii, and 13 more
When it flowers
JFMAMJJASOND
Not known yet in the tropics: too few flowering observations to read a season from.
PetsNC State Extension lists it as toxic to dogs, cats and horses (25 Oct 2026)
PeopleNC State Extension lists it as mildly poisonous (rhizomes) (25 Oct 2026)
If a child, a pet or anyone may have eaten a plant, contact a doctor or vet straight away, or call the National Poisons Information Centre (AIIMS, New Delhi) on 1800 116 117, free and open 24 hours.
Something wrong with it?About it
- Grows as
- Rhizomatous geophyte or helophyteKew's checklist, not yet checked
- Climate
- TemperateKew's checklist, not yet checked
- Wild in
- Europe to Caucasus, Medit. to IranKew's checklist, not yet checked
- Light
- Full sun (6 h or more)Read from NC State Extension, one source
- Height
- 91 cmRead from NC State Extension, one source
- Water
- Plenty: wet or constantly moistRead from NC State Extension, one source
- Flowers
- YellowRead from NC State Extension, one source
- Coldest it survives
- -28.9 °C (USDA zone 5a)Read from NC State Extension, one source
Not known yet: spread, heat, hottest it survives.
In other languages (2)
- Dutch
- Gele lis
- French
- Iris des Marais
Where this comes from
- Wikidata, read 2026-10-25, CC0-1.0
- Kew's checklist, read 2026-10-24, CC-BY-4.0
- NC State Extension, read 2026-10-25, fact, cited
- Wikimedia Commons, read 2026-10-25, CC BY-SA 3.0
- 3D model: Iris pseudacorus (built for Vanagrha) by Vanagrha, own
A fact “checked by a majority of its sources” was settled by a vote of the pages it was read from, not by a person reading it; one marked “one source” rests on that page alone. Anything else not marked checked has not been checked yet. Where nothing is known, the page says so rather than guess.